N, n&#39;-diarylnaphthoquinone-imines



United States Patent 2,982,596 N,N-DIARYLNAPHTHOQUINONE-IMINES Mei-inn, Bottmingen, near Basel, Switzerland, as-

signor to Sandoz Ltd., Basel, Switzerland No Drawing. Filed Nov. 6, 1958, Ser. No. 772,157

Claims priority, application Switzerland Jan. 15, 1954 12 Claims. (Cl. 857) The present invention is a continuation-in-part appliand one mol of an arylann'ne of the formula with one mol of naphthazarine intermediate.

cation to the co-pending application Ser. No. 480,998, 1

filed on January 10, 1955, and relates to N,N'-diarylnaphthoquinone-imines, and particularly to a group of these compounds which draw onto acetate silk, and synthetic polyamide and polyester fibers in green shades and which yield dyeings which are distinguished by good to very good fastness to light, washing and sublimation and which, additionally, are dischargeable.

The aforesaid N,N-diarylnaphthoquinone-imines of the present invention correspond to the formula no rsQo-cm-om-monwm-o-m R is hydrogen, lower alkoxy or R is hydrogen or lower alkyl.

The aforesaid dyestufis according'to the present inven- The naphthazarine intermediate, which in the literature is also designated as 5-amino-8-hydroxy-l,4-naphthoquinone-l-imine, can be prepared by known methods, for example, by treating 1,5-dinitronaphthalene with sulfur sesquioxide. I p

Illustrative of amines of the benzene series which are suitable, according to the present invention, for condensation with the naphthazarine intermediate are inter alia:

1- 2'-(2-hydroxy) -ethoxy] -ethoxy-4-aminobenzene, [2'-( 2"-methoxy) -ethoxy] -ethoxy-4-aminobenzene, [2-( 2"-ethoxy -ethoxy] -ethoxy-4-aminobenzene, [2'-( 2"-'propoxy) -ethoxy] -ethoxy-4-aminobenzene, [2'-( 2"-butoxy) -ethoxy] -ethoxy-4-aminobenzene,

Suitable condensing agents for the purpose of the present invention are preferably organic solvents such,

' for example, as ethyl alcohol, benzyl alcohol, glacial at raised temperature and, if desired, in the presence of a tion are obtained by reacting one mol of the naphtha-' zarine intermediate of the formula 'mo-o-ntcro-mm-oOg ll This compound can be recrystallized from ethanol and, i v in the pure state, melts at 111-1 12. This new dyestufi,

dissolves with green coloration in ethyl alcohol and with I 7 bluish. green coloration in conc'entrated sulfuric acid: 4

Qispersedinjhe usual way in water, it dyes acetate silk and syiithetifpolyamide fibers in pureigr'een' shades oi 3 arylamine 0f the formula acetic acid, etc. I p

The reaction of the naphthazarine intermediate with the arylamine or arylamines is advantageously carried out appropriate catalysts such for example as boric acid, sodium acetate, copper bronze, copper salts, etcL,"

The following examples set forthpresently-preferred representative embodiments of the inventiomthesc examples are intended to be illustrative and not at all limitative. The parts are parts by weight. Temperaturesa're in degrees centigrade. V a Example 1 ethoxy-4-aminobenzene are added to the resultant solution. The originally violet solution first turns blue and finally green.

results in the precipitation of the produced N,N'-di{4- 'none-imine which corresponds to the formula [25- (2" rnethoxy)-ethoxy]v-ethoxy}-phe'nylnaphthot11ii I H Ratented May 2, 1961 After heating for 7 hours, the solution is, cooled and is then diluted with 500 parts of water. This I very good.fastness to light, washing and sublimation. It is also suitable for dyeing. synthetic polyester fibers, in which case it is advantageous to use raised pressure or to operate in the presence. oflcarriers in the dyebath.

In contrast to this new dyestufi, the correspondingly prepared products from one mol of naphthazarine intermediate and two mols of aminobenzene or two mols of 1-hydroxy-4-amino-benzene, which contain no ether groups, have no afiinity for acetate silk and synthetic polyamide fibers.

Example 2 63 parts of naphthazarine intermediate-zinc chloride double salt (obtained according to the data of PB 73377 Micro-films, frames 2226-2228) are reacted at 100 with 85 parts of 1-[2-(2-methoxy)-ethoxy]-ethoxy-4-aminobenzene in 300 parts of glacial acetic acid. At the end of 2 /2 hours the resultant solution has a full green color. The solution is filtered 03 from ethanol-insoluble residue, and the filtrate is poured onto 5000 parts of ice water. In a short time, the produced dyestufi separates out in filtrable form. It contains a trace of naphthazarine intermediate but is otherwise identical with the dyestulf obtained according to Example 1. Its green dyeings on acetate silk and synthetic polyamide fibers are very vivid; its deyeings on polyester fibers are slightly more yellow.

By proceeding after the manner set forth in Examples 1 and 2 an additional series of condensation products according to the present invention can be obtained from one mol of naphthazarine intermediate and two mols of the following amino compounds:

Color of the Example Amino intermediate Dyestufl No. Solution in Ethanol (1) (2) (3) 1-[2' 2 ethoxy) ethoxy] ethoxy 4 green.

nminobenzene. 1 [2 (2" bumxy) ethoxy] ethoxy 4 Do.

aminobemene. 1 [2 (2 hydroxy) ethxy1- ethoxy 4- Do.

aminobenzene. l [2- (2 hydroxy) ethoxy] ethoxy 2- Do.

chlorot aminobenzene. 1 i2 (2 a methoxy) ethoxy1- ethoxy 2- Do.

chloroA-aminobenzene. l- [2' (2 methoxy) ethoxy] ethoxy 2- D0.

bromo4-arninobenzene. 1 [2 (2" ethoxy) ethoxy] ethoxy 2- Do.

chloro-l-aminobeuzene.

Example 30.8 parts'of the mono-condensation product, obtain- Zable according to U.S. Patent No. 2,066,119, from one part of napththazarine intermediate and one part of land which is soluble with blue-green coloration in pure sulfuric acid and dyes acetate silk in pure green shades.

In corresponding manner, the dyestutf N-phenyl-N- {4 [2 (2"-methoxy)-ethoxy]-ethoXy}-phenyl-naphthoquinone-imine, which corresponds tothe formula nso-o-ntcro-nioro-Qg 0 can be prepared from the mono-condensation prodnct obtainable according to US. Patent No. 2,135,366 from q m a qu n e nap t azari s te med a and .arninobenzene.

Example 11 A dyebath is prepared from 0.6 part of the dyestufi prepared according to Example 1 and dispersed with the aid of Turkey-red oil, 6 parts of a fatty alcohol sulfonate and 3000 parts of water. 100 parts of acetate silk are introduced into the bath at room temperature (2030), and the bath then heated to inthe course of 1 hour and maintained at 80 for an additional hour. At the end of this time, the dyeing process is finished. The dyed material is withdrawn from the bath and is rinsed and dried. To enhance the dispersion, the dyestulf may be preliminarily ground with a suitable wetting agent, dispersing agent or emulsifier, preferably in the presence of an inorganic salt such as Glaubers salt. The dyestufi may also be intimately admixed in the form of an aqueous paste with a dispersing agent and, by suitable drying, converted into the form of a dyestufl. powder.

Having thus disclosed the invention, what is claimed 1. N,N-diary]naphthoquinonedmine of the formula no 1 -rQo-oin.-o-om-0-m I ll REG-N O v I I V mow-mm-o-mm-mO- d 3. N,N-diary1naphthoquinone-imine of the formula no nOo-mm-o-mm-o-Gm 4. N,N'-diary1naphthoquinone-imine of the formula 5. N,N-diarylnaphthoquinone-imine of the formula nQo-om-wonmw-om HO i rOo-cnrom-o-cm-om-on CHz-CHr-OH 6. N,N-diarylnaphthoquinone-imine of the formula no IHIOO-CHr-CHa-O-CIIr-OHz-b-CH:

mo-Hio-oON H 7. A method of dyeing acetate silk which comprises applying thereto an aqeons dispersion of a dyestutf according to claim 1.

8. A method of dyeing acetate silk which comprises applying thereto an aqueous dispersion of a dyestufi according to claim 2.

9. A method of dyeing acetate silk which comprises applying thereto an aqueous dispersion of a dyestuff according to-claim 3.

10. A method of dyeing acetate silk which comprises applying thereto an aqueous dispersion of a dyestutf according to claim 4.

11. A method of dyeing acetate silk which comprises applying thereto an aqueous dispersion of a dyestufi according to claim 5.

12. A method of dyeing acetate silk which comprises applying thereto an aqueous dispersion of a dyestutf according to claim 6. 

1. N,N''-DIARYLNAPHTHOQUINONE-IMINE OF THE FORMULA
 7. A METHOD OF DYEING ACETATE SILK WHICH COMPRISES APPLYING THERETO AN AQEOUS DISPERSION OF A DYESTUFF ACCORDING TO CLAIM
 1. 